code: def test_default_arg_single_out(self):
      def foo(a, b=2):
          return a * b
  
      d = {"a": 5}
      dres = adaptor(foo, "c")(d)
      self.assertEqual(dres["c"], 10)
  
      d = {"b": 5}
      with self.assertRaises(TypeError):
          dres = adaptor(foo, "c")(d)
  
file_path: MONAI/tests/test_adaptors.py
imports: from __future__ import annotations
  import itertools
  import unittest
  from monai.transforms.adaptors import FunctionSignature, adaptor, apply_alias, to_kwargs
label_desc: Use image node_id 4 for calling the TestAdaptors obj's underlying member method code with example usage: obj.test_default_arg_single_out() and returns: unknown